NATIONAL ALUMINIUM COMPANY LIMITED - Rites

iii) LED status indication iv) BCD input units suitable for four digit input
• Analog input units shall be as follows:
i) Suitable for 4-20 20 mA / 00-10V
/ +/-10V inputs
ii) With necessary A/D converter
• Pulse/ frequency input module shall have range up to 50 kHz. For very high frequency
applications, the range shall be up to 1 MHz.
Output units
• High Density (32/16 Channel), modular and plug plug-in type
• Discrete output units shall be as follows:
i) Opto-isolated isolated outputs with insulation level of 1.5 kV
ii) Rated for 24V DC, 2A
• Power devices like contactor or odd voltage actuating device shall b bbe
actuated through
relays
• LED status indication
• BCD output units shall be as follows:
i) Suitable for four digit output
ii) Rated to drive seven segment LED displays
iii) With insulation level of 1.5 kV
• Analog outputs shall be as follows
i) Suitable for 4-20mA/ 20mA/ 00-10V/
+/-10V 10V outputs capable of driving Digital / Analog Panel
Meters
ii) With necessary D/A converters
iii) With insulation level of 1.5 kV
iv) Any special requirement to control field devices shall be met by using separate
interface modules
PC based programming unit:
• PC used for Programming Terminal shall be commercial grade and latest available in the
Suitable for developing programs in ladder diagram/ block diagram or statement form
• With facility for loading the program from floppy
• The terminal shall be capable of developing multiple programs offline without connecting to
the programmable controller.
Self diagnostic features
• Parity errors, cycle errors and under voltage
• Failure in central processor unit, memory and power sup supply.
• Indication of type of failure
• Automatic turning OFF of all outputs or optionally holding of all outputs in their last state on
failure detection.
Additional features
• Fully pre-programmed
• Connection of field devices with input units throu through ordinary multi-core
copper control
cables of 1.5 sq. mm size, upto a length of 500 m.
Technical Specification:Sec-6, Electrical
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